//第五种方法  
var idTmr;  
function  getExplorer() {  
    var explorer = window.navigator.userAgent ;  
    //ie  
    if (explorer.indexOf("MSIE") >= 0) {  
        return 'ie';  
    }  
    //firefox  
    else if (explorer.indexOf("Firefox") >= 0) {  
        return 'Firefox';  
    }  
    //Chrome  
    else if(explorer.indexOf("Chrome") >= 0){  
        return 'Chrome';  
    }  
    //Opera  
    else if(explorer.indexOf("Opera") >= 0){  
        return 'Opera';  
    }  
    //Safari  
    else if(explorer.indexOf("Safari") >= 0){  
        return 'Safari';  
    }  
}  
function method5(tableid) {  
    if(getExplorer()=='ie')  
    {  
        var curTbl = document.getElementById(tableid);  
        var oXL = new ActiveXObject("Excel.Application");  
        var oWB = oXL.Workbooks.Add();  
        var xlsheet = oWB.Worksheets(1);  
        var sel = document.body.createTextRange();  
        sel.moveToElementText(curTbl);  
        sel.select();  
        sel.execCommand("Copy");  
        xlsheet.Paste();  
        oXL.Visible = true;  

        try {  
            var fname = oXL.Application.GetSaveAsFilename("Excel.xls", "Excel Spreadsheets (*.xls), *.xls");  
        } catch (e) {  
            print("Nested catch caught " + e);  
        } finally {  
            oWB.SaveAs(fname);  
            oWB.Close(savechanges = false);  
            oXL.Quit();  
            oXL = null;  
            idTmr = window.setInterval("Cleanup();", 1);  
        }  

    }  
    else  
    {  
        tableToExcel(tableid)  
    }  
}  
function Cleanup() {  
    window.clearInterval(idTmr);  
    CollectGarbage();  
}  
var tableToExcel = (function() {  
    var uri = 'data:application/vnd.ms-excel;base64,',  
            template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel"'+
            'xmlns="http://www.w3.org/TR/REC-html40"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet>'
            +'<x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets>'
            +'</x:ExcelWorkbook></xml><![endif]-->'+
            ' <style type="text/css">'+
            '.excelTable  {'+
            'border-collapse:collapse;'+
             ' border:thin solid #999; '+
            '}'+
            '   .excelTable  th {'+
            '   border: thin solid #999;'+
            '  padding:20px;'+
            '  text-align: center;'+
            '  border-top: thin solid #999;'+
            ' background-color: #E6E6E6;'+
            ' }'+
            ' .excelTable  td{'+
            ' border:thin solid #999;'+
            '  padding:2px 5px;'+
            '  text-align: center;'+
            ' }</style>'+
            '<meta charset="utf-8">'+
            '</head><body ><table class="excelTable">{table}</table></body></html>',  
            base64 = function(s) { return window.btoa(unescape(encodeURIComponent(s))) },  
            format = function(s, c) {  
                return s.replace(/{(\w+)}/g,  
                        function(m, p) { return c[p]; }) }  
    return function(table, name) {  
        console.log(table);
        if (!table.nodeType) table = document.getElementById(table)  
        var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML}  
        window.location.href = uri + base64(format(template, ctx))  
    }  
})()